Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b97453a7ce7574…

MALICIOUS

PDF

83.0 KB Created: 2021-04-25 19:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 25d30f5567c5a1fe4fba67f62da6b177 SHA-1: e7a927164efdb8f8fddc96b90a385acabd2aa98e SHA-256: 66b97453a7ce7574e8672ae1cddc9c337487939c443f71cc3967d2d6eb54b884
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of external links, identified as a link farm, with many hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or SEO manipulation. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=how+to+hard+reset+ipod+nano+6th+generation+without+itunes PDF link annotation
    • http://banademebilite.sportsontheweb.net/36555501062.pdfIn PDF document text
    • https://cdn.sqhk.co/nenakowi/N7J47je/73767780185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_60380ee87d192.pdfIn PDF document text
    • https://cdn.sqhk.co/zimalodepafo/bioKjjA/79604577729.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402951/normal_60068cfb500ed.pdfIn PDF document text
    • http://nitafibejuze.mygamesonline.org/71532625374.pdfIn PDF document text
    • https://cdn.sqhk.co/wunasesev/jdheL45/jilulixerorisitage.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/DMkjjsl/dj_scratch_sound_effect_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415936/normal_60604e08963e5.pdfIn PDF document text
    • https://cdn.sqhk.co/soxobiwefili/9ngcxid/remudidefit.pdfIn PDF document text
    • http://majexifavel.scienceontheweb.net/toby_carvery_menu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486346/normal_5fcbe236ea7f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407316/normal_602197e08577d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5185de0-749c-4f4c-adb0-b0a34f8416d8/charles_bukowski_the_mind_go_all_the_way_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ca9172e-2e6c-410c-b852-b933d1be52ad/how_long_to_study_for_nasm_exam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9cd6ee3-4554-43ad-bc04-23071b3cb9f8/gexikirozikofovadox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aaf0ccc8-a9d1-4609-beb2-822833586f21/13937063505.pdfIn PDF document text
    • https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_ee4a45c49f674f25be66dce566db5a53.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/97081506-fc6a-4f9f-bf5e-846c8fada84a/52355808717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98170833-f566-4d84-97c0-26c59b38a461/how_to_get_minecraft_on_ps_vita.pdfIn PDF document text
    • http://jabodegodonirad.atwebpages.com/vocabulary_workshop_level_d_unit_6_antonyms_answers.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_888d2555198642d4b5212af4a9ae1cf0.pdf?index=trueIn PDF document text
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_d32631b41d0a485da5aa1f2cffe54672.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/894feb31-0ef1-44bd-8c34-38f12ddef11c/32429092641.pdfIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_407007753d7748afb55c8c13a2fb5d29.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10274 5396 bytes
SHA-256: 22fb10b55a3d8f4a126ffb749c3cb3fe3da5531e4bc905f546a581d88aa4f184
font_01_sfnt_off000114d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D6 12948 bytes
SHA-256: 3f70aadea05232863fcfaab66fdf20f8d2948d8a9a279c3a337327bc7a1bbbab